Hard Mathematics Chapter 1: Real Numbers Class 10 Level 14

कौन-सी संख्या \(\sqrt{45}\) के बराबर है और अपरिमेय भी है?

Which number is equal to \(\sqrt{45}\) and is also irrational?

Explanation opens after your attempt
Correct Answer

A. \(3\sqrt{5}\)

Step 1

Concept

\(45=9\times5\).

Step 2

Why this answer is correct

\(\sqrt{45}=\sqrt{9}\sqrt{5}=3\sqrt{5}\), and \(\sqrt{5}\) is irrational.

Step 3

Exam Tip

Separate the largest perfect square factor while simplifying surds. चरण 1: \(45=9\times5\) है। चरण 2: \(\sqrt{45}=\sqrt{9}\sqrt{5}=3\sqrt{5}\), और \(\sqrt{5}\) अपरिमेय है। चरण 3: मूल को सरल करते समय सबसे बड़े पूर्ण वर्ग गुणनखंड को अलग करें।

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What is the correct answer to this Mathematics MCQ?

The correct answer is A. \(3\sqrt{5}\).

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